package day07;

import java.util.Random;

/**
 * 生成？位大写字母、小写字母、数字验证码
 */

public class VerificationCode1 {
    public static void main(String[] args) {
        String code = genetateVerificationCode(6);
        System.out.println("验证码是："+code);

    }
    public static String genetateVerificationCode(int len){
        String code = "";
        char [] chs ={'a','b','c','d','e','f','g','h','i','j','k','l',
                      'm','n','o','P','q','r','s','t','u','v','w','x',
                      'y', 'z','A','B','C','D','E','F','G','H','I','J',
                      'K','L','M','N','O','P','Q','R','S','T','U','V','W',
                      'X','Y','Z','1','2','3','4','5','6','7','8','9','0'};
        Random rand = new Random();
        for(int i = 0;i<len;i++){
            int index = rand.nextInt(chs.length);
            code += chs[index];
        }
        return code;
    }
}
